E.References
that document changes over the last ~5 years (i.e., since the IPCC TAR) in the
coupled model or its components. We are specifically looking for references
that document changes in some aspect(s) of model performance.

II.Besides
atmosphere, ocean, sea ice, and prescription of land/vegetated surface, what
can be included (interactively) and was it active in the model version that
produced output stored in the PCMDI database?

A.atmospheric
chemistry?

No

B.interactive
biogeochemistry?

No

C.what
aerosols and are indirect effects modeled?

The distributions of marine, desertic,
urban aerosols, sulfate aerosols are specified. Marine and desertic aerosols
are constant in all experiments. Urban aerosols vary according to estimates
between 1850 and 2000. Sulfate aerosols are specified in all experiments
according to Boucher and Pham (2002) data, see http://www-loa.univ-lille1.fr/~boucher/sres/
for more details. Note that only the direct effect of anthropogenic sulfate
aerosols was taken into account.

D.dynamic
vegetation?

No

E.ice-sheets?

Fixed

III.List
the community based projects (e.g., AMIP, C4MIP, PMIP, PILPS, etc.) that your
modeling group has participated in and indicate if your model results from each
project should carry over to the current (IPCC) version of your model in the PCMDI
database.

AMIP (older version)

CMIP (older version)

PMIP 6k BP simulation with former version of ARPEGE-Climat (older
version)

a.Clouds:
- statistical cloud scheme for stratiform clouds based on Ricard and Royer
(1993). Convective cloud cover based on the mass-flux transport

b.Convection
- mass-flux convective scheme with Kuo-type closure based on Bougeault (1985)
boundary layer based on Louis et al. (1982) with modifications by Mascart et
al. (1995). SW, LW radiation based on Fouquart and Morcrette
parameterizations implemented in a former version of the ECMWF model (Morcrette
JJ, 1990; Morcrette JJ, 1991)

c.any
special handling of wind and temperature at top of model:
- relaxation of temperature, linear (Rayleigh) friction for wind

B.Ocean

1.resolution

The model has 35 vertical layers
and approximately square horizontal grid cells with 1.5° grid spacing along the equator. Near the equator the meridional
grid spacing is gradually decreased to 0.5°
at the equator.

There are no grid singularities in
the ocean domain. Grid singularities are placed over Antarctica and Siberia.

D.land / ice
sheets (some of the following may be omitted if information is clearly included
in cited references.

The land surface scheme ISBA
(Interactions Soil Biosphere Atmosphere) developed initially by Noilhan and Planton
(1989) has been updated and described by Mahfouf et al. (1995).

1.resolution
(tiling?), number of layers for heat and water

Hor. Res.: same as atmospheric
grid. 4 soil layers for heat and 2 for water

2.treatment
of frozen soil and permafrost

Yes

3.treatment
of surface runoff and river routing scheme

The TRIP dataset (Oki and Sud,
1998) has been used to connect land grid cells to ocean runoff discharge coast
grid cells. Runoff is stored in a reservoir which is drained with an e-folding
time scale of 7 days.

9.ice
sheet characteristics (How are snow cover, ice melting, ice accumulation, ice
dynamics handled? How are the heat and water fluxes handled when the ice sheet
is melting?)

Ice sheet are represented simply
by prescribing initially a huge snow amount and applying to it the same snow
parameterization as over the land surface.

Ice dynamics is not included

E.coupling
details

Coupling between atmosphere, ocean
and sea ice models is done through the OASIS 2.2 coupler developed at CERFACS.
Note that the sea ice model is included in the ocean model. For a reference of
the coupling software, see Terray et al. (1998).

V.Simulation
Details (report separately for each IPCC simulation contributed to database at
PCMDI):

Picntrl/Run_1

This preindustrial control
simulation was initialized from an ocean at rest with temperature and salinity
profiles specified from Levitus (1982). The BCM was then integrated for 80 year
with preindustrial 1860 greenhouse gases concentrations as a spin-up. After
this spin-up period results have been stored from years 1850 to 2100 (250
years)

20C3M/Run_1

This simulation was initialized from
January/1850 of the Picntrl/Run_1 simulation

Solar forcing was set at 1368 W/m2
and no solar or volcanic variability were included. The greenhouse gases annual
global concentrations were specified based on observations as specified in the
ENSEMBLES project webpage (http://www.cnrm.meteo.fr/ensembles/public/results/results.html).
Sulfate aerosols are specified according to Boucher and Pham (2002) data (http://www-loa.univ-lille1.fr/~boucher/sres/).
Results are given for the years 1850 to 2000

SRESA2/Run_1

This simulation was initialized
from January/2000 of the 20C3M/Run_1 simulation.

This simulation was initialized
from January/2000 of the 20C3M/Run_1 simulation. The greenhouse gases annual
global concentrations were specified based on scenario SRES A1B as specified in
the ENSEMBLES project webpage (http://www.cnrm.meteo.fr/ensembles/public/results/results.html).
Sulfate aerosols are specified according to Boucher and Pham (2002) data (http://www-loa.univ-lille1.fr/~boucher/sres/).
Results are given for years 2000 to 2300.

SRESB1/Run_1

This simulation was initialized
from January/2000 of the 20C3M/Run_1 simulation. The greenhouse gases annual
global concentrations were specified based on scenario SRES B1 as specified in
the ENSEMBLES project webpage (http://www.cnrm.meteo.fr/ensembles/public/results/results.html).
Sulfate aerosols are specified according to Boucher and Pham (2002) data (http://www-loa.univ-lille1.fr/~boucher/sres/).
Results are given for years 2000 to 2300.

1%to2x/Run_1

This simulation was initialized
from January/2000 of the PIcntrl/Run_1 simulation. This initial state
corresponds to year 1860 CO2 concentrations. The concentrations of greenhouse
gases are held constant at preindustrial levels, except for CO2, which
increases from its preindustrial level (286 ppm) at the rate of 1% per year,
until the initial concentration is doubled. From the time of doubling, the
concentrations of all radiative forcing are held constant for 10 years. Results
are given for years 2000 to 2080.